From the third week to the eighth week of gestation, the product of conception (conceptus) is referred to as the:
a. Zygote
b. Embryo
c. Fetus
d. Infant
ANS: B
The embryonic period of development extends from the third to the eighth week after conception. At fertilization, a zygote is formed from the nucleus of the sperm and the nucleus of the ovum. The fetal period begins with the ninth week after conception and extends until the infant is born at delivery.
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